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How do you diagnose bad battery cable?

Updated: 12/16/2022
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14y ago

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Because a battery cable is basically a large gauge/diameter length of wire with connectors on each end, a bad one is going to show its problems - look for corrosion on the connectors - even just a 'glazing-over' of the metals.

Use a wire brush to ensure good electrical connection at the battery and engine block (negative), and starter or wherever the other end connects to.

I'm sure you can put a voltmeter on the cable and check for excessive resistance and more sophisticated diagnostics, but if in doubt, I just replace any suspect cable.

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Q: How do you diagnose bad battery cable?
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